CN107958771A - Ignition coil for explosive motor - Google Patents
Ignition coil for explosive motor Download PDFInfo
- Publication number
- CN107958771A CN107958771A CN201710962316.2A CN201710962316A CN107958771A CN 107958771 A CN107958771 A CN 107958771A CN 201710962316 A CN201710962316 A CN 201710962316A CN 107958771 A CN107958771 A CN 107958771A
- Authority
- CN
- China
- Prior art keywords
- convex surface
- surface forming
- forming portion
- axial direction
- connecting portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/12—Ignition, e.g. for IC engines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T13/00—Sparking plugs
- H01T13/02—Details
- H01T13/04—Means providing electrical connection to sparking plugs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P13/00—Sparking plugs structurally combined with other parts of internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P3/00—Other installations
- F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
- F02P3/04—Layout of circuits
Abstract
A kind of ignition coil (1) for explosive motor includes coil main body part (2), connecting portion (3) and conductive member (4).Convex surface forming portion (311) is arranged in connecting portion (3), which is to form the part of inner circumferential convex surface (33), and the inner peripheral surface on the inner circumferential convex surface is protruded towards inner circumferential side.Convex surface forming portion (311) has periphery concave surface (32), and the outer circumferential surface of the periphery concave surface is recessed towards inner circumferential side.Connecting portion (3) has a boundary portion (312), which is border of the convex surface forming portion (311) between other parts in an axial direction z.In convex surface forming portion (311), at least a portion in the region formed with periphery concave surface (32) has the area in the cross section for being orthogonal to axial direction Z equal to or less than the part of the area of the cross section of the axial direction in boundary portion (312).The thickness of convex surface forming portion (311) is equal to or more than the thickness of boundary portion (312).
Description
Technical field
The present invention relates to a kind of ignition coil for explosive motor.
Background technology
For example, patent document 1 (for example, Japanese Patent No. 4267042) discloses a kind of point for explosive motor
Firewire circle, the ignition coil are included with the primary coil being magnetically coupling to one another and the main body of secondary coil, and for connecting master
The plug sleeve of body and spark plug.
Plug sleeve in a tubular form, and is flexibility and electric insulation.For being electrically connected the coil spring of secondary coil and spark plug
It is inserted into and is arranged on inside plug sleeve.
Plug sleeve has the function that to make the external electrical insulation of the coil spring and plug sleeve inside insertion plug sleeve.
Here, ignition coil can be used by the way that plug sleeve is inserted into curved consent.
In view of this, the ignition coil disclosed in patent document 1 has be formed in plug sleeve in the axial direction one
Thin-walled portion in point.Thin-walled portion is set to be formed as than other portions by the way that the inner circumferential side of the outer circumferential surface towards the plug sleeve that make plug sleeve is recessed
Divide thinner.
Therefore, the ignition coil purpose disclosed in patent document 1 is in causing plug sleeve to be easily bent in thin-walled portion
And easily it is inserted into curved consent.
However, the withstanding voltage of plug sleeve is the thickness according to plug sleeve come definite.That is, the thickness of plug sleeve is lower, then is resistant to
Voltage is lower.
Therefore, in patent document 1 in disclosed ignition coil, it is desirable to which the thickness of at least thin-walled portion is greater than or equal to
May insure plug sleeve it is inside and outside between electric insulation thickness.
In addition, when plug sleeve is bent in thinner wall section office, the part stretched due to bending is produced in thin-walled portion.
The thickness of the part becomes than the smaller when this is partially under the unbent free state of plug sleeve.
Therefore, in the curved ignition coil in thin section office, it is contemplated that the thin section after plug sleeve is bent in thin section office
The thickness divided is thinning, so may not obtain to obtain the adequate thickness of insulation in thin section office.
At the same time, the wall thickness of part of the plug sleeve in addition to thin-walled portion must than ensure plug sleeve it is inside and outside it
Between electric insulation needed for thickness it is thicker enough.This causes the increase of the cost and size of plug sleeve.
The content of the invention
The present invention is to propose in view of the above problems, and purpose be to provide one kind can obtain insulate while
Cost of implementation reduces and the ignition coil for explosive motor of size reduction.
In the ignition coil for explosive motor according to first aspect, ignition coil, which includes having, to be magnetically coupling to one another
Primary coil and the coil main body part of secondary coil, the tubular connecting portion for connecting coil main part and spark plug,
And it is arranged on inside connecting portion and is electrically connected the conductive member of coil main part and spark plug.
Convex surface forming portion is arranged in connecting portion, which is to form the part on inner circumferential convex surface, the inner circumferential convex surface
Inner peripheral surface protruded towards inner circumferential side, convex surface forming portion has periphery concave surface, and the inward-facing side in periphery of the periphery concave surface is recessed, and
And connecting portion has a boundary portion, which is the border between convex surface forming portion and other parts in the axial direction.
In the forming portion of convex surface, at least a portion in the region formed with periphery concave surface, which has, is being orthogonal to axial direction
Cross section in area be equal to or less than the cross section for being orthogonal to axial direction in boundary portion area part, it is and convex
The thickness of face forming portion is equal to or more than the thickness of boundary portion.
In the ignition coil for explosive motor, convex surface forming portion has periphery concave surface, the periphery of the periphery concave surface
It is recessed towards inner circumferential side.
Therefore, connecting portion can obtain enough flexibilities in the periphery concave surface for the convex surface forming portion that outside diameter reduces.
Further, in the forming portion of convex surface, at least a portion in the region formed with periphery concave surface has orthogonal
Area in the cross section of axial direction is equal to or less than the area of the cross section for being orthogonal to axial direction in boundary portion
Part.
Enough flexibilities are also obtained in the periphery concave surface of this convex surface forming portion in connecting portion.
Here, as noted previously, as convex surface forming portion is easily bent, therefore compared with other parts, it is contemplated that due to curved
It is thinning, it is necessary to higher withstanding voltage caused by song.
Therefore, in ignition coil, the thickness of convex surface forming portion is set equal to or the thickness more than boundary portion.
Therefore, can be connected by the way that the thickness of convex surface forming portion to be set as obtaining to the thickness of withstanding voltage
Whole withstanding voltages in portion.
It is possible to further suppress in connecting portion in addition to the forming portion of convex surface need not be than convex surface forming portion higher
The thickness increase of the part of withstanding voltage.
Therefore, the material cost of connecting portion can be reduced and connecting portion size can be reduced.
As described above, according to above-mentioned aspect, can provide one kind can reduce cost and diminution while insulation is ensured
The ignition coil for explosive motor of size.
Brief description of the drawings
In the accompanying drawings：
Fig. 1 shows the partial axial section view of the ignition coil for explosive motor in first embodiment.
Fig. 2 shows the enlarged view of the periphery of the convex surface forming portion of Fig. 1；
Fig. 3 shows the viewgraph of cross-section along the line III-III of Fig. 1；
Fig. 4 shows the viewgraph of cross-section along the line IV-IV of Fig. 1；
Fig. 5 shows the diagram for illustrating the thickness of the bendable portion in first embodiment and the area of cross section；
Fig. 6 shows that ignition coil in the first embodiment is attached to the view of the mounting structure of explosive motor；
Fig. 7 shows the amplification longitudinal cross-sectional view of the periphery of convex surface forming portion in a second embodiment；
Fig. 8 shows the diagram for illustrating the thickness of the bendable portion in second embodiment and the area of cross section；
Fig. 9 shows the amplification longitudinal cross-sectional view of the periphery of convex surface forming portion in the third embodiment；
Figure 10 shows the partial axial section view of the ignition coil for explosive motor in fourth embodiment；
Figure 11 shows the partial axial section view of the ignition coil for explosive motor in the 5th embodiment；
Figure 12 shows the amplification longitudinal cross-sectional view of the periphery of the convex surface forming portion in the first modified example；
Figure 13 shows the amplification longitudinal cross-sectional view of the periphery of the convex surface forming portion in the second modified example；And
Figure 14 shows the amplification longitudinal cross-sectional view of the periphery of the convex surface forming portion in the 3rd modified example.
Embodiment
[first embodiment]
By referring to figs. 1 to embodiment of Fig. 6 descriptions for the ignition coil of explosive motor.
As shown in Figure 1, the ignition coil 1 for explosive motor of the present embodiment has coil main body part 2, connecting portion
3 and conductive member 4.
Coil main body part 2 has the primary coil and secondary coil being magnetically coupling to one another (both of which is not shown).
As shown in fig. 6, connecting portion 3 connects coil main part 2 and spark plug 100.
As shown in Figures 1 to 4, connecting portion 3 has tubular form.
As shown in Figure 1, conductive member 4 is arranged on inside connecting portion 3.
As shown in fig. 6, conductive member 4 is electrically connected secondary coil and spark plug 100.
As depicted in figs. 1 and 2, connecting portion 3 is provided with convex surface forming portion 311, which is that composition inner circumferential is convex
The part in face 33, the inward-facing side protrusion of inner circumferential on the inner circumferential convex surface 33.
Convex surface forming portion 311 has periphery concave surface 32, and the inward-facing side in periphery of the periphery concave surface is recessed.
Connecting portion 3 has boundary portion 312, which is in convex surface forming portion on the axial direction Z of connecting portion 3
Border between 311 and other parts.
Shown in following article Fig. 5 to be described, in convex surface forming portion 311, in the region formed with periphery concave surface 32 extremely
There is a few part area in the cross section for being orthogonal to axial direction Z to be orthogonal to axial direction equal to or less than boundary portion 312
The part of area in the cross section of direction Z.
The thickness of convex surface forming portion 311 is equal to or more than the thickness of boundary portion 312.
It is noted that hereinafter, when simply relating to the area of cross section, unless otherwise stated, referring to orthogonal
Area in the cross section of axial direction Z.
In addition, the area of the cross section of convex surface forming portion 311 is, for example, the area for the cross section cs that shade is applied in Fig. 3.
Similarly, the area of the cross section of boundary portion 312 is, for example, the area for the cross section cs that shade is applied in Fig. 4.
In other words, it is not include that convex surface, which forms the area of the cross section of part 311 or the area of the cross section of boundary portion 312,
The area of the cross section of the annular region of the hollow space of connecting portion 3.
As shown in fig. 6, the ignition coil 1 of the present embodiment is connected to the explosive motor installed in motor vehicles, thermoelectricity connection
Produce on the spark plug 100 in equipment etc., and be used as applying high-tension device to spark plug 100.
Ignition coil 1 is used by being inserted into connecting portion 3 in the consent 12 of engine cylinder cover 11.
In this example, it is assumed that even if the consent 12 that the connecting portion 3 of ignition coil 1 is inserted into has Z in the axial direction
On the curved bending section 121 in substantially central portion office, however, the present invention is not limited thereto.
As shown in Figure 1, coil case 2 is by being contained in the primary coil and secondary coil structure in the housing 21 being electrically insulated
Into.In the present embodiment, housing 21 is formed from a resin.
It will be noted that forming core of the magnetic circuit in magnetic field etc. as caused by energization primary coil is also contained in housing 21
In.
Housing 21 has a tubular high voltage tower portion 211 just projected upwards of Z in the axial direction.
Below, the protrusion side of the high voltage tower portion 211 of housing 21 in an axial direction z is known as front, and
Opposite side can be known as base end side.
Resistor 13 is inserted into and is arranged in high voltage tower portion 211.Resistor 13 suppress noise current from be connected to igniting
The spark plug 100 of coil 1 is delivered to secondary coil.
Assembled from the front in high voltage tower portion 211 with connecting portion 3 in high voltage tower portion 211.
In the present embodiment, connecting portion 3 includes the seal of flexible especially caulking gum 34, rod-shaped connector
(pole joint) 35 and cock cap 36.
As shown in fig. 6, caulking gum 34 carries out between the engine cylinder cover 11 that coil case 2 and ignition coil 1 are inserted
Sealing.
Rod-shaped connector 35 is assemblied in one end for being provided with spark plug 100 of caulking gum 34.Rod-shaped connector 35 is by resin-made
Into.
Rod-shaped connector 35 for example by PPS (i.e. polyphenylene sulfide), PBT (i.e. polybutylene terephthalate (PBT) resin),
Unsaturated polyester (UP) etc. is made.
Cock cap 36 is assembled with spark plug 100.The base end part of cock cap 36 is assembled to the front end of rod-shaped connector 35.Although sealing
Rubber 34 and cock cap 36 are made of silicon rubber, but material not limited to this.
As shown in Figure 1, convex surface forming portion 311 is formed in caulking gum 34.
Caulking gum 34 has the rubber base end part 341 for being assembled to high voltage tower portion 211 at its base end part.
In addition, caulking gum 34 has the rubber front end for the base end part for being assembled to rod-shaped connector 35 in its front end
342。
Further, in an axial direction z, it is between the rubber base end part 341 and rubber front end 342 of caulking gum 34
Hereinafter by the bendable portion 31 of description.
Bendable portion 31 be connecting portion 3 can elastic bend part.
Here, can elastic bending mean to bend when an external force is applied, and can be substantially when discharging external force
Return to reset condition.
For example, the rod-shaped connector 35 of connecting portion 3 is formed from a resin and is therefore not elastically bendable.
Further, since the rubber base end part 341 and rubber front end 342 of connecting portion 3 are equipped with height made of such as resin
Voltage tower portion 211 and the rigid element of rod-shaped connector 35, therefore even if apply to rubber base end part 341 and rubber front end 342
External force, rubber base end part 341 and rubber front end 342 will not be bent.
Therefore, rubber base end part 341 and rubber front end 342 are not elastically bendable parts.
In the present embodiment, at least in an axial direction z from the front end in the high voltage tower portion 211 of caulking gum 34 to rod-shaped
The region of the cardinal extremity of connector 35 is bendable portion 31.
There is convex surface forming portion 311 in the part of the bendable portion 31 of connecting portion 3 in an axial direction z.
As shown in fig. 6, in the state of ignition coil 1 is inserted into the consent 12 of engine cylinder cover 11,311 shape of convex surface forming portion
As be arranged in face of consent 12 bending section 121 position at.
As shown in Fig. 2, inner circumferential convex surface 33 is formed so that the part of the inner peripheral surface of connecting portion 3 in an axial direction z is straight
Footpath reduces.
That is, inner circumferential convex surface 33 is formed on the whole periphery of connecting portion 3.
In connecting portion 3, the region from inner circumferential convex surface 33 one end in an axial direction z to the other end is convex surface forming portion
311。
In addition, as described above, convex surface forming portion 311 includes periphery concave surface 32.
Periphery concave surface 32 is formed so that a part of diameter of the outer circumferential surface of connecting portion 3 in an axial direction z reduces.
That is, periphery concave surface 32 is formed in the whole circumference of connecting portion 3.
At least a portion in the region formed therein in an axial direction z formed with inner circumferential convex surface 33 of periphery concave surface 32
On.
In the present embodiment, the region formed therein in an axial direction z formed with inner circumferential convex surface 33 of periphery concave surface 32
Whole region in.
In the cross section parallel to axial direction Z through the central axis O of connecting portion 3, inner circumferential convex surface 33 is towards axial direction
Center on the Z of direction gradually inwardly attenuates, and in substantially V shapes.
Similarly, in the cross section parallel to axial direction Z of the central axis through connecting portion 3, periphery concave surface 32
It is with its center on axial direction Z and the shape of close inner circumferential side with tilting, and with substantially V-shape shape.
When the part in inner circumferential convex surface 33 with minimum diameter is defined as minimum diameter portion 331 and by periphery concave surface 32
In there is the part of minimum outer diameter when being defined as minimum outer diameter portion 323, minimum diameter portion 331 and minimum outer diameter portion 323 are in axial direction
It is arranged on the Z of direction at same position.
In the present embodiment, in the horizontal stroke parallel to axial direction Z of the central axis O through connecting portion 3 as shown in Figure 2
Section (being expressed as central axial section below) place, the minimum diameter portion 331 on inner circumferential convex surface 33 show as not growing substantially
Spend the point of a pair first portion 33a of (i.e. narrow portion).
Further, in the present embodiment, at central axial section as shown in Figure 2, the minimum of periphery concave surface 32 is outer
Footpath portion 323 shows as a pair of of the second point portion 32a for not having length (i.e. narrow portion) substantially.
In addition, in central axial section, the virtual line N of connection the first point portion 33a of a pair and a pair of of second point portion 32a
It is orthogonal to the central axis O of connecting portion 3.
It should be noted that in central axial section, the void of connection the first point portion 33a of a pair and a pair of of second point portion 32a
Intending straight line can be relative to the straight incline for the central axis O for being orthogonal to connecting portion 3.
Fig. 5 shows first to the 3rd diagram G1, G2 and G3 that will be described below and arrangement is put.
First diagram G1 shows the center that connecting portion 3 is passed through in the periphery of the convex surface forming portion 311 in ignition coil 1
The longitudinal cross-sectional view parallel to axial direction Z of axis.
In the first diagram G1, the longitudinal axis shows position z in an axial direction z, and transverse axis shows and shows first
Scheme the position x being orthogonal in the cross section of G1 on the direction X of axial direction Z.
Second diagram G2 shows that the position z of the inner peripheral surface of bendable portion 31 in an axial direction z exists with bendable portion 31
The relation between thickness d at the z of position.
Here, thickness d of the bendable portion 31 at an arbitrary position at z is from the optional position on the inner peripheral surface of bendable portion 31
Beeline of the part of z to the outer circumferential surface of bendable portion 31.
For example, as shown in Figure 3 and Figure 5, it is thick when position z is located at the position in the minimum diameter portion 331 on inner circumferential convex surface 33
The value for spending d is the thickness of convex surface forming portion 311 in radial directions.
Further, as shown in Figure 4 and Figure 5, when position z is located at the position of boundary portion 312, the value of thickness d is side
The thickness of portion of boundary 312 in radial directions.
Further, as shown in figure 5, when position z is at the position z1 between minimum diameter portion 331 and boundary portion 312
When, the value d1 of thickness d is thickness of the bendable portion 31 on the direction for favouring radial direction.
3rd diagram G3 shows that the position z of bendable portion 31 in an axial direction z is being orthogonal to axis with bendable portion 31
Relation between the area s of the cross section (for example, the cross section indicated by the reference marker cs in Fig. 3, Fig. 4 etc.) of direction Z.
In each in three diagrams shown in Fig. 5, represent that the longitudinal axis of position z in an axial direction z is identical
's.
Further, in the second diagram G2, thickness d on transverse axis is towards becoming larger on the right side of attached drawing, and towards a left side for attached drawing
Side diminishes.
In addition, in the 3rd diagram G3, the area s of the cross section on transverse axis is towards becoming larger on the right side of attached drawing, and towards attached drawing
Left side diminish.
Then, carried out according to the second diagram G2 and the 3rd diagram G3 between boundary portion 312 and convex surface forming portion 311 to thickness
Spend the comparison of d and the comparison of the area s to cross section.
It should be noted that as described above, boundary portion 312 be between convex surface forming portion 311 and the other parts of connecting portion 3
Border on axial direction Z.
That is, the part where two ends of inner circumferential convex surface 33 in an axial direction z is the boundary portion 312 in connecting portion 3.
Such as it is more than or waits on whole axial direction Z from the second diagram G2 findings of Fig. 5, the thickness of convex surface forming portion 311
In the thickness of boundary portion 312.
In addition, the thickness of convex surface forming portion 311 removes convex on whole axial direction Z more than or equal to bendable portion 31
The thickness of part beyond into portion 311.
Both ends of the thickness of convex surface forming portion 311 from convex surface forming portion 311 in an axial direction z are thickening to center.
Then, in convex surface forming portion 311, the minimum diameter portion 331 on inner circumferential convex surface 33 and periphery are recessed in an axial direction z
The thickness for the part that the minimum outer diameter portion 323 in face 32 is formed is maximum.
Further, such as from the 3rd diagram G3 findings in Fig. 5, the area of the cross section of convex surface forming portion 311 is whole
It is equal to or less than the area of the cross section of boundary portion 312 on axial direction Z.
In addition, the area of the cross section of convex surface forming portion 311 is equal to or less than bendable portion 31 on whole axial direction Z
In part in addition to convex surface forming portion 311 cross section area.
The area of the cross section of convex surface forming portion 311 reduces as it is close to center from the both ends on axial direction Z.
Then, in convex surface forming portion 311, the minimum diameter portion 331 on inner circumferential convex surface 33 and periphery are recessed in an axial direction z
The area of the cross section for the part that the minimum outer diameter portion 323 in face 32 is formed is minimum.
As shown in Figure 1, conductive member 4 is arranged on inside connecting portion 3.
In the present embodiment, conductive member 4 is by being helically wrapped conducting wire formed and be configured to can be in axial side
Elastic deformation on to Z.
Conductive member 4 has constant outside diameter in an axial direction z.
As shown in Fig. 2, conductive member 4 is assemblied in the inner circumferential convex surface 33 of the convex surface forming portion 311 of connecting portion 3.Thus, lead
Electric components 4 position in an axial direction z relative to connecting portion 3.
As shown in Figure 1, conductive member 4 at its base end part by the resistor 13 being arranged in high voltage tower portion 211 towards base
Side elasticity pressing.Thus, conductive member 4 is electrically connected to secondary coil by the grade of resistor 13.
Further, as shown in fig. 6, when spark plug 100 is assembled in cock cap 36, the front end of conductive member 4 will
The base end part of spark plug 100 is pressed towards front elasticity.Thus, conductive member 4 and spark plug 100 are electrically connected.
Hereafter, the function and effect of the present embodiment will be described.
In the ignition coil 1 for explosive motor, convex surface forming portion 311 has periphery concave surface 32, the periphery concave surface
The 32 inward-facing side in periphery is recessed.
Therefore, connecting portion 3 can obtain enough soft in the periphery concave surface 32 for the convex surface forming portion 311 that outside diameter reduces
Property.
In addition, in convex surface forming portion 311, at least a portion in the region formed with periphery concave surface 32, which has, to be orthogonal to
Area in the cross section of axial direction Z is equal to or less than the face of the cross section for being orthogonal to axial direction Z in boundary portion 312
Long-pending part.
This convex surface in connecting portion 3 forms in the periphery concave surface 32 of part 311 and also obtains enough flexibilities.
Here, since convex surface forming portion 311 as described above is easily bent, compared with other parts, it is contemplated that due to
It is thinning, it is necessary to higher withstanding voltage caused by bending.
Therefore, in ignition coil 1, the thickness of convex surface forming portion 311 is set equal to or the thickness more than boundary portion 312
Degree.
Therefore, can be by the way that the thickness of convex surface forming portion 311 to be set as obtaining to the thickness of suitable withstanding voltage
And obtain whole withstanding voltages of connecting portion 3.
It is possible to further suppress in connecting portion 3 in addition to convex surface forming portion 311 need not be than convex surface forming portion 311
The thickness increase of the part of the withstanding voltage of higher.
Thus, it is possible to reduce the material cost of connecting portion 3 and the size of connecting portion 3 can be reduced.
Further, conductive member 4 is assembled in the inner circumferential convex surface 33 of convex surface forming portion 311 of connecting portion 3.
, still can be by by conduction as described above, for example, even if the diameter of conductive member 4 is constant in an axial direction z
Component 4, which is assembled to, assembles conductive member 4 in inner circumferential in the inner circumferential convex surface 33 with larger inner diameter in convex surface forming portion 311
In convex surface 33.
Therefore, easily conductive member 4 is assembled in connecting portion 3.
Further, the minimum diameter portion 331 on inner circumferential convex surface 33 and the minimum outer diameter portion 323 of periphery concave surface 32 are in axial side
It is arranged on to Z at same position.
Therefore, can the company of being partially located in formed with minimum diameter portion 331 and minimum outer diameter portion 323 in an axial direction z
Enough flexibilities are obtained in socket part 3.
In addition, in the present embodiment, convex surface forming portion 311 from its both ends in an axial direction z with close to center and
The area of the cross section of thickness and smaller with bigger.
Therefore, while the withstanding voltage of connecting portion 3 is obtained, can be obtained in convex surface forming portion 311 enough soft
Property.
As described above, according to this embodiment, it can provide one kind can obtain insulate while cost of implementation reduce and
The ignition coil for explosive motor of size reduction.
[second embodiment]
As shown in Figure 7 and Figure 8, compared with first embodiment, the present embodiment is the reality for the shape for changing convex surface forming portion 311
Apply example.
As shown in fig. 7, in the cross section parallel to axial direction Z by the central axis of connecting portion 3, inner circumferential convex surface
33 are formed as the arc-shaped of inside peripheral side protrusion.
Similarly, in the cross section parallel to axial direction Z by the central axis of connecting portion 3, periphery concave surface 32
Be formed as the arc-shaped of inside peripheral side protrusion in radial directions.
Periphery concave surface 32 is formed therein vertically at least a portion in the region formed with inner circumferential convex surface 33 on Z.
Specifically, in the middle section in the region formed therein formed with inner circumferential convex surface 33 of periphery concave surface 32.
Fig. 8 shows and arranges first to the 3rd diagram G1, G2 and the G3 put.First to the 3rd diagram G1, G2 and G3
It is similar with the diagram described in first embodiment.
Equally in the present embodiment, according to the second diagram G2 and the 3rd diagram G3, in boundary portion 312 and convex surface forming portion
The comparison to thickness d and the comparison of the area s to cross section are carried out between 311.
Equally in the present embodiment, the boundary portion 312 of connecting portion 3 is two ends of inner circumferential convex surface 33 in an axial direction z
Part where portion.
It is such as gradual from both ends in an axial direction z towards center from the second diagram G2 findings, the thickness of convex surface forming portion 311
Increase, and hereafter thickness is gradually reduced.
However, equally in the present embodiment, the thickness of convex surface forming portion 311 is equal to or more than on whole axial direction Z
The thickness of boundary portion 312.
Such as from the 3rd diagram G3 findings, the part in the region in an axial direction z formed with periphery concave surface 32, convex surface
Form the part of the area for the cross section that there is the area of cross section to be equal to or less than boundary member 312 for part 311.
The area of the cross section of convex surface forming portion 311 increases from both ends in an axial direction z towards periphery concave surface 32.
However, in the region of periphery concave surface 32 in formed with convex surface forming portion 311 in an axial direction z, cross section
Area from the both ends on axial direction Z towards center reduce.
Then, the middle body in the region of the periphery concave surface 32 in formed with convex surface forming portion 311 in an axial direction z
In, the area of cross section is equal to or less than the area of the cross section of boundary portion 32.
In convex surface forming portion 311, minimum diameter portion 331 and periphery formed with inner circumferential convex surface 33 in an axial direction z
The area of the cross section of the part in the minimum outer diameter portion 323 of concave surface 32 is minimum.
Other constructions are identical with first embodiment.
It is to be understood that in second embodiment and subsequent embodiment, unless otherwise stated, and first embodiment
In same or similar component be endowed identical reference numeral, and the structure and features of repetition is will not be described again, to keep away
Exempt from the explanation of redundancy.
The present embodiment also has the function of and effect identical with first embodiment.
[3rd embodiment]
As shown in figure 9, compared with second embodiment, the present embodiment is the embodiment for the shape for changing periphery concave surface 32.
In the present embodiment, in the cross section parallel to axial direction Z by the central axis of connecting portion 3, periphery
Concave surface 32 is formed as the U-shaped protruded inwardly from radial directions.
That is, periphery concave surface 32 is by a pair of of line part 321 for radially linearly being formed in cross-section, and in inner circumferential
The arch portion 322 for having arc-shaped to side and the inner circumferential end of a pair of of line part 321 being connected to each other is formed.
Equally in the present embodiment, the boundary portion 312 of connecting portion 3 is two ends of inner circumferential convex surface 33 in an axial direction z
Part where portion.
Other constructions are identical with second embodiment.The present embodiment also has the function of and effect identical with second embodiment.
[fourth embodiment]
As shown in Figure 10, the present embodiment is the embodiment for the position for changing convex surface forming portion 311 from first embodiment.
I.e., in the present embodiment, convex surface forming portion 311 is formed in cock cap 36.
Cock cap 36 has the cap base end part 361 to be assembled to the front end of rod-shaped connector 35, and in the front end of cock cap 36
Side has bendable portion 31.
In the present embodiment, bendable portion 31 is formed so that size in an axial direction z is more than cap base end part 361.
Although being not shown, spark plug 100 is assembled in cock cap 36 from the front of cock cap 36.
In the state of spark plug 100 is assembled in cock cap 36, convex surface forming portion 311 is formed in the cardinal extremity of spark plug 100
The base end side at edge.
Other constructions are identical with first embodiment.The present embodiment also has the function of and effect identical with first embodiment.
[the 5th embodiment]
As shown in figure 11, the present embodiment is the embodiment for the construction for changing connecting portion 3 from first embodiment.
In the present embodiment, connecting portion 3 is all formed by same material.In the present embodiment, connecting portion 3 all by
Silicon rubber is integrally molded.However, the material for forming connecting portion 3 is not limited to silicon rubber.
In the present embodiment, connecting portion 3 has the connection base end part 37 to be assembled to high voltage tower portion 211, and even
The distal side of socket part 3 has bendable portion 31.
Then, convex surface forming portion 311 is formed in a part for bendable portion 31.
Other constructions are identical with first embodiment.The present embodiment also has the function of and effect identical with first embodiment.
The invention is not restricted to above-described embodiment, can also be applied to various realities without departing from the scope of the invention
Apply example.
For example, the state in the consent of ignition coil insertion engine cylinder cover is shown in each of above-described embodiment
The lower example being arranged on the convex surface forming portion of connecting portion in consent, however, the present invention is not limited thereto.
That is, in the state of in the consent that ignition coil is inserted into engine cylinder cover, connecting portion, which can have, is formed in plug
Convex surface forming portion outside hole.
In this case, connecting portion is in consent outer bend.
Further, even if in the above-described embodiments, the minimum diameter portion 331 on inner circumferential convex surface 33 has the first point portion 33a
And the minimum outer diameter portion 323 of periphery concave surface 32 has the state of second point portion 32a, however, the present invention is not limited thereto.
As shown in figure 12, for example, the minimum outer diameter portion 323 of periphery concave surface 32 can be in an axial direction z with constant
Length.
In this case, second point portion is formed without in minimum outer diameter portion 323.
Further, as shown in figure 13, the minimum diameter portion 331 on inner circumferential convex surface 33 can have perseverance in an axial direction z
Fixed length.
In this case, the first point portion is formed without in minimum diameter portion 331.
In addition, as shown in figure 14, the minimum diameter portion 331 on inner circumferential convex surface 33 and the minimum outer diameter portion 323 of periphery concave surface 32
Can have constant length in an axial direction z.
In this case, the first point portion and second point portion are formed without in convex surface forming portion 311.
As described above, at least one aspect being formed without in the first point portion and second point portion can also be used.
Claims (6)
1. a kind of ignition coil (1) for explosive motor, including：
Coil main body part (2), it has the primary coil and secondary coil being magnetically coupling to one another；
Tubular connecting portion (3), it is used to connect the coil main body part and spark plug (100)；And
Conductive member (4), it is arranged on inside the connecting portion and is electrically connected the coil main body part and the spark plug；
Wherein
Convex surface forming portion (311) is arranged in the connecting portion, and the convex surface forming portion is to form the part of inner circumferential convex surface (33),
The inner peripheral surface on the inner circumferential convex surface is protruded towards inner circumferential side；
The convex surface forming portion has periphery concave surface (32), and the outer circumferential surface of the periphery concave surface is recessed towards the inner circumferential side；
The connecting portion has a boundary portion (312), and the boundary portion is the convex surface forming portion and other on (Z) in the axial direction
Border between part；
In the convex surface forming portion, at least a portion in the region formed with the periphery concave surface have be orthogonal to it is described
Area in the cross section of axial direction is equal to or less than the cross section for being orthogonal to the axial direction in the boundary portion
The part of area, and the thickness of the convex surface forming portion is equal to or more than the thickness of the boundary portion；And
The thickness of the convex surface forming portion is equal to or more than the thickness of the boundary portion.
2. the ignition coil according to claim 1 for explosive motor, wherein
The conductive member is assemblied in the inner circumferential convex surface of the convex surface forming portion of the connecting portion.
3. the ignition coil according to claim 1 or 2 for explosive motor, wherein
The connecting portion includes：
Seal (34), it has elasticity for the engine cylinder cover (11) inserted in the ignition coil and the coil
Sealed between main part；
Rod-shaped connector (35) made of resin, it is assembled to the seal in the at one end of the setting spark plug；And
Cock cap (36), it is setting the at one end of the spark plug to be assembled to the rod-shaped connector and filled with the spark plug
Match somebody with somebody；Wherein
The convex surface forming portion is formed in the seal.
4. the ignition coil according to claim 1 or 2 for explosive motor, wherein
The connecting portion includes：
Seal (34), it has elasticity for the engine cylinder cover (11) inserted in the ignition coil and the coil
Sealed between main part；
Rod-shaped connector (35) made of resin, it is assembled to the seal in the at one end of the setting spark plug；And
Cock cap (36), it is setting the at one end of the spark plug to be assembled to the rod-shaped connector and filled with the spark plug
Match somebody with somebody；Wherein
The convex surface forming portion is formed in the cock cap.
5. the ignition coil according to claim 1 or 2 for explosive motor, wherein
The connecting portion is all integrally formed by same material.
6. the ignition coil according to any one of claim 1 to 5 for explosive motor, wherein
When the part in the inner circumferential convex surface with minimum diameter is defined as minimum diameter portion (331) and the periphery is recessed
When the part with minimum outer diameter is defined as minimum outer diameter portion (323) in face, the minimum diameter portion and the minimum outer diameter portion
It is arranged on the axial direction at same position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016203604A JP6772752B2 (en) | 2016-10-17 | 2016-10-17 | Ignition coil for internal combustion engine |
| JP2016-203604 | 2016-10-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107958771A true CN107958771A (en) | 2018-04-24 |
| CN107958771B CN107958771B (en) | 2021-06-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710962316.2A Active CN107958771B (en) | 2016-10-17 | 2017-10-17 | Ignition coil for internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US10366827B2 (en) |
| JP (1) | JP6772752B2 (en) |
| CN (1) | CN107958771B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6528573B2 (en) * | 2015-07-13 | 2019-06-12 | 株式会社デンソー | Igniter |
| DE102018108292B4 (en) * | 2017-11-17 | 2023-05-11 | Borgwarner Ludwigsburg Gmbh | Connector for connecting an ignition coil to a spark plug and protective tube for a connector |
| JP7107023B2 (en) * | 2018-06-26 | 2022-07-27 | 株式会社デンソー | Ignition coil for internal combustion engine and ignition device for internal combustion engine |
| JP7263191B2 (en) * | 2019-09-26 | 2023-04-24 | 日立Ａｓｔｅｍｏ阪神株式会社 | IGNITION COIL FOR INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD |
| US11404204B2 (en) * | 2020-04-28 | 2022-08-02 | Denso Corporation | Ignition coil for internal combustion engine |
| CN115013216B (en) * | 2022-07-14 | 2024-01-02 | 东风汽车集团股份有限公司 | Ignition assembly for igniting compression ignition engine, engine and vehicle |
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| FR2643194B1 (en) * | 1989-02-14 | 1993-12-17 | Musorb Application Ferrites | DEVICE FOR ELECTRICALLY CONNECTING A CABLE, ESPECIALLY IGNITION, TO A PLOT |
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| JP5776411B2 (en) * | 2011-07-28 | 2015-09-09 | 株式会社デンソー | Ignition coil for internal combustion engines |
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Also Published As
| Publication number | Publication date |
|---|---|
| US10366827B2 (en) | 2019-07-30 |
| JP2018066275A (en) | 2018-04-26 |
| CN107958771B (en) | 2021-06-08 |
| JP6772752B2 (en) | 2020-10-21 |
| US20180108473A1 (en) | 2018-04-19 |
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